1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.lang.module.ModuleDescriptor;
25import java.lang.module.ModuleFinder;
26import java.lang.module.ModuleReader;
27import java.lang.module.ModuleReference;
28import java.net.URI;
29import java.util.HashMap;
30import java.util.HashSet;
31import java.util.Map;
32import java.util.Objects;
33import java.util.Optional;
34import java.util.Set;
35
36
37/**
38 * This class consists exclusively of static utility methods that are useful
39 * for creating tests for modules.
40 */
41
42public final class ModuleUtils {
43    private ModuleUtils() { }
44
45
46    /**
47     * Returns a ModuleFinder that finds modules with the given module
48     * descriptors.
49     */
50    static ModuleFinder finderOf(ModuleDescriptor... descriptors) {
51
52        // Create a ModuleReference for each module
53        Map<String, ModuleReference> namesToReference = new HashMap<>();
54
55        for (ModuleDescriptor descriptor : descriptors) {
56            String name = descriptor.name();
57
58            URI uri = URI.create("module:/" + name);
59
60            ModuleReference mref = new ModuleReference(descriptor, uri) {
61                @Override
62                public ModuleReader open() {
63                    throw new UnsupportedOperationException();
64                }
65            };
66
67            namesToReference.put(name, mref);
68        }
69
70        return new ModuleFinder() {
71            @Override
72            public Optional<ModuleReference> find(String name) {
73                Objects.requireNonNull(name);
74                return Optional.ofNullable(namesToReference.get(name));
75            }
76            @Override
77            public Set<ModuleReference> findAll() {
78                return new HashSet<>(namesToReference.values());
79            }
80        };
81    }
82
83}
84